Agreed, it's amazing how pervasive this myth is despite the glaring flaw you mentioned. The last time there was a suitable control group was during the Vietnam

Agreed, it's amazing how pervasive this myth is despite the glaring flaw you mentioned. The last time there was a suitable control group was during the Vietnam war, when people flocked to colleges based on their draft number rather than their career ambitions [1]. Unfortunately, that was over 40 years ago. [1] http://www.nber.org/papers/w4067 http://www.nber.org/papers/w4067